It had been reported that at around 4pm on that day, a group had approached passengers and demanded their phones and personal items.
Two males, both 17, have been released on bail pending further enquiries.
Detective Sergeant Michael Ogiliev, of GMP's Oldham division, said: "We took these reports incredibly seriously and I hope that these arrests show that we are determined to bring about justice for the victims in these robberies.
"We are still asking for any witnesses to please come forward, as any information, big or small, could greatly help us with our investigations."
Information can be shared by calling 0161 856 4521 quoting log 2479 of 12/5/23.
A report can also be made via GMP's website: www.gmp.police.uk
Alternatively, call the independent charity, Crimestoppers, anonymously on 0800 555 111.
